Osteosarcoma radioinduced after adenoid cystic tumor of the parotid gland.

Osteosarcoma can develop secondary to malignant transformation within a preexisting benign bone lesion, such as Paget disease, osteonecrosis, fibrous dysplasia, and chronic infection, or it can arise in previously irradiated areas. This article presents the case of a 36-year-old woman who was affected by a radioinduced osteosarcoma after radiotherapy for an adenoid cystic carcinoma of the left parotid gland treated when she was 24 years old.